5128661 has 2 divisors, whose sum is σ = 5128662. Its totient is φ = 5128660.

The previous prime is 5128657. The next prime is 5128667. The reversal of 5128661 is 1668215.

It is a happy number.

5128661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3960100 + 1168561 = 1990^2 + 1081^2 .

It is a cyclic number.

It is not a de Polignac number, because 5128661 - 2² = 5128657 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5128667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2564330 + 2564331.

It is an arithmetic number, because the mean of its divisors is an integer number (2564331).

Almost surely, 2^5128661 is an apocalyptic number.

It is an amenable number.

5128661 is a deficient number, since it is larger than the sum of its proper divisors (1).

5128661 is an equidigital number, since it uses as much as digits as its factorization.

5128661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 29.

The square root of 5128661 is about 2264.6547198193. The cubic root of 5128661 is about 172.4519056568.

The spelling of 5128661 in words is "five million, one hundred twenty-eight thousand, six hundred sixty-one".